Chronic Spontaneous Urticaria
Chronic spontaneous urticaria is a frustrating skin condition that causes itchy hives to appear repeatedly for weeks, months, or even years—often without any clear reason or trigger.
Table of contents
- What is Chronic Spontaneous Urticaria?
- Medical Identification Codes
- Signs and Symptoms
- Who Gets Chronic Spontaneous Urticaria?
- What Causes This Condition?
- Factors That Can Make Symptoms Worse
- How is it Diagnosed?
- Treatment Options
- Self-Care and Lifestyle Adjustments
- What to Expect Over Time
What is Chronic Spontaneous Urticaria?
Chronic spontaneous urticaria is a condition where itchy, raised red bumps called hives (also known as wheals) appear on the skin at least twice a week for more than six weeks[1][3]. The term “spontaneous” means these hives come and go without any clear trigger or cause[2]. Each individual hive typically lasts between 30 minutes and 24 hours before fading away, but new ones may continue to appear[2][7].
chronic idiopathic urticaria, CIU, CSU, chronic hives
This condition is different from acute hives, which last less than six weeks and are often caused by something identifiable like a food allergy or viral infection[12]. With chronic spontaneous urticaria, most people cannot identify what triggers their symptoms, making it particularly challenging to manage[2].
The condition primarily affects people during their working years, with symptoms lasting anywhere from one to five years in most cases, though some people experience symptoms for longer periods[3][11]. School or job performance and sleep can be substantially affected by the constant itching and discomfort[3].
Medical Identification Codes
L50.1; L50.8
Signs and Symptoms
The main symptom of chronic spontaneous urticaria is the appearance of raised, itchy bumps on the skin. These wheals can vary greatly in size—from as small as a pinprick to larger than a softball—and can appear anywhere on the body[5][7]. The bumps may be red or the same color as your skin[1].
A telling feature of these hives is something called “blanching,” which means the center of a red hive turns white when you press on it[1][5]. The affected areas may also feel warm to the touch[2].
In addition to hives, many people with this condition experience angioedema, which is swelling in the deeper layers of the skin[2]. This swelling commonly affects the lips, cheeks, areas around the eyes, arms, legs, or genitals[2]. Between 30% and 50% of people with chronic spontaneous urticaria will experience angioedema along with their hives[3][7]. Some people may also experience numbness or tingling in the swollen areas[2].
Beyond the visible symptoms on the skin, chronic spontaneous urticaria can cause other problems that affect daily life. Many people experience headaches, fatigue, joint pain or swelling, gastrointestinal symptoms, flushing, wheezing, and heart palpitations[7].
Who Gets Chronic Spontaneous Urticaria?
Chronic spontaneous urticaria affects between 0.5% and 1% of the general population at any given time[3][11]. Anyone can develop this condition, but it is twice as common in women as in men[1][3][5].
The condition usually begins when people are in their 20s, 30s, or 40s, though it can appear at any age[2][3][11]. In children, chronic spontaneous urticaria is less common, affecting between 0.1% and 3% of this age group[11].
People who already have allergies, eczema, asthma, or food allergies may be more likely to develop chronic spontaneous urticaria[2].
What Causes This Condition?
For up to 95% of people who have chronic spontaneous urticaria, there is no clear cause—this is what the medical term “idiopathic” means[2]. However, research has provided some insights into what may be happening in the body.
The immune system plays a central role in this condition. When you have chronic spontaneous urticaria, certain cells in your body called mast cells are activated and release chemicals, including histamine, into the skin tissue[6]. These chemicals cause the red, itchy, raised rash that characterizes hives[6].
Research suggests that in about half of people with chronic spontaneous urticaria, the cause is autoimmune[2][6]. This means the body’s immune system mistakenly attacks its own healthy tissues. The body produces autoantibodies—proteins that target the body’s own cells—which then activate mast cells and trigger the release of histamine[3].
The condition is sometimes linked to other health problems. Autoimmune conditions such as thyroid disease, celiac disease, lupus, rheumatoid arthritis, and type 1 diabetes are more common in people with chronic spontaneous urticaria than in the general population[2][5]. Other conditions that may be associated include liver disease, sinus infections, and certain lymphomas[5].
It is important to understand that chronic spontaneous urticaria is not caused by allergies to external substances like foods[1][6]. While patients often believe their condition is due to food allergies, this has been established to be incorrect for almost all people with this disorder[1].
Factors That Can Make Symptoms Worse
While there may not be a clear cause for chronic spontaneous urticaria, certain things can trigger a flare-up or make existing hives worse. Common triggers include alcohol, cold temperatures, exercise, heat, hot showers, humidity, tight clothing, rubbing or scratching the skin, and spicy foods[2][14].
Certain medications, particularly nonsteroidal anti-inflammatory drugs like aspirin and ibuprofen, can worsen symptoms[2]. Physical pressure on the skin, such as from carrying a heavy bag on your shoulder, may also lead to hives in that area[2].
Stress is one of the biggest known triggers for chronic spontaneous urticaria[14]. Many healthcare providers find that patients develop symptoms after a stressful event in their lives[2].
Sunlight exposure can also trigger hives in some people[14]. If you can identify your personal triggers, avoiding them may help prevent flare-ups or reduce the severity of symptoms[2].
How is it Diagnosed?
The diagnosis of chronic spontaneous urticaria is based mainly on a thorough medical history and physical examination[3][5]. Your healthcare provider will examine your skin and ask detailed questions about your symptoms, including when they started, how often they occur, and what they look like[2].
If you have hives on most days of the week for six weeks or longer, you may have chronic spontaneous urticaria[2]. One distinguishing feature is that the welts come and go randomly, with each spot usually lasting less than 24 hours without leaving a bruise or scar[3][5].
Your healthcare provider may ask you to keep a diary to track your activities, medications, herbal remedies or supplements you take, what you eat and drink, where hives appear, and how long each welt lasts[5][10].
Recent guidelines recommend avoiding extensive testing, because most patients will have no identifiable cause[3]. Initial investigations should be limited to basic tests such as a complete blood count with differential, C-reactive protein, and erythrocyte sedimentation rate to rule out underlying inflammatory conditions or diseases[3][7].
If needed to clarify the diagnosis, your healthcare provider might perform a skin biopsy, which involves removing a small sample of skin tissue for testing in a laboratory[10]. There is no specific single test to diagnose chronic spontaneous urticaria—the diagnosis is made based on your pattern of symptoms over time[2].
Treatment Options
The main goal of treatment for chronic spontaneous urticaria is to relieve symptoms, since the condition is often self-limiting and will eventually resolve on its own[3]. Treatment typically follows a step-by-step approach.
The first-line treatment is non-sedating antihistamines[1][3]. These medications work by blocking the effect of histamine, the chemical in the skin that causes the itching and hives[1]. Common second-generation antihistamines include cetirizine, fexofenadine, loratadine, desloratadine, bilastine, and rupatadine[17]. These are preferred over older, first-generation antihistamines because they cause less drowsiness and have fewer side effects[3][12].
Daily use of antihistamines is recommended rather than taking them only when symptoms appear[17]. If standard doses don’t control your symptoms well enough (which happens in up to 50% of cases), your healthcare provider may increase the dose up to four times the usual daily amount[1][3].
If high-dose antihistamines don’t provide adequate relief, the next step is omalizumab, a medication given by injection at a dose of 300 mg per month[9][12]. This treatment is effective in about 70% of people who don’t respond well to antihistamines alone[12].
For patients who don’t respond to both antihistamines and omalizumab, cyclosporine is recommended as the next option[12]. This medication is similarly effective in 65% to 70% of patients, but careful monitoring is needed because it can affect blood pressure and kidney function[12].
Short courses of corticosteroids (such as prednisone) can be used for severe flare-ups, typically lasting one to two weeks[1][17]. However, long-term use of steroids should be avoided due to significant side effects that accumulate over time[1][12].
Other medications that may be tried include montelukast, doxepin, tacrolimus, hydroxychloroquine, mycophenolate, dapsone, and sulfasalazine[1][10][12]. These are typically reserved for cases that don’t respond to the standard treatments mentioned above.
Self-Care and Lifestyle Adjustments
In addition to medical treatment, several self-care measures can help you manage symptoms and reduce flare-ups.
Learning to identify and avoid your personal triggers is important. If you know that certain foods, activities, or environmental conditions make your hives worse, avoiding them when possible can help prevent new outbreaks[2][10].
Managing stress is crucial, as it is one of the biggest triggers for chronic spontaneous urticaria[14]. Activities like yoga, walking or other exercise, breathing exercises, meditation, or therapy can help you better manage stress and anxious thoughts[14].
Getting enough sleep is important because poor sleep affects your immune system and can increase stress reactions[14]. Build better sleep habits and talk with your healthcare provider about treatments to ease nighttime symptoms that interfere with rest.
Temperature management can make a big difference. If you are sensitive to heat, avoid hot showers, hot environments, and very hot foods or drinks[14]. If you react to cold, stay warm and avoid cold water and cold weather exposure. Lukewarm water is often a good choice to help limit flares[14].
Wearing loose, cotton clothing instead of tight or scratchy fabrics can reduce skin irritation[14][16]. Pressure and rubbing from tight waistbands, sleeves, or straps can irritate your skin and cause hives to appear[14].
To soothe itchy skin, apply cream-based or light moisturizers with anti-itch ingredients such as menthol[6]. Avoid using perfumed or scented products, as these can cause more irritation[6]. Applying an ice pack or taking a cool bath can often calm the itch sensation, unless cold temperatures trigger your hives[6].
Try to avoid scratching, as this releases more histamine and will make you itch even more[6][16]. If sunlight triggers your symptoms, practice sun protection by using sunscreen and limiting sun exposure[14].
What to Expect Over Time
Chronic spontaneous urticaria typically lasts for one to five years before spontaneously resolving in most people, though severe cases can persist longer[3][7][11]. Between 30% and 50% of people experience spontaneous remission, meaning their symptoms go away on their own[7].
It’s important to be patient with treatment. Finding the right treatment approach may take time, and your healthcare provider will work with you to find the combination that provides the best relief[2]. Even after a long symptom-free period, symptoms can sometimes recur[17].
While chronic spontaneous urticaria can significantly affect your quality of life, interfering with sleep, work, and social activities, it is generally not a dangerous condition[3][17]. With proper treatment and self-care, most people can achieve good symptom control and maintain their normal daily activities.
